Joint element for construction set



FIG. 1 is a top perspective view of a joint element for construction set showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a joint element for construction set, as shown. 